Should I remove old attic insulation before adding new?

• <div><p>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: </p><ul><li><p>If the insulation is over 15 years old</p></li><li><p>If the insulation is wet or moldy</p></li><li><p>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></p></li><li><p>If you see signs of pest infestation</p></li></ul><p>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</p></div>

Do insulation companies need to be licensed?

• <div><p>In some areas, insulation companies require a special license, while some states only require them to hold general contractor licenses. Some municipalities may not mandate any license, although you should always ensure a contractor is fully insured. You can use Angi’s <a href="https://www.angi.com/angi-license-check.htm">license lookup tool</a> to confirm whether or not an insulation contractor you’re considering holds the necessary license for your area. You can also contact the company for information regarding licenses, certifications, and insurance.</p></div>

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Last update on July 26, 2026

Reviewed in July 2026
Seriously wonderful company! Everyone does a fantastic job and always goes above and beyond to make sure things are done right and efficiently. We had an entire new furnace and AC system installed and did vent sealant and MAN the difference in our home and utilities speak for themselves. This...
Home Comfort Services, LLC
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Reviewed in June 2026
Rhodes plumbing does all of my new construction, and remodel plumbing, they are second to none when it comes to their thankless water heater installation. Always on time, always on budget, always there when you need them!
Rhodes Plumbing LLC
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Reviewed in March 2026
The crew installed a wooden fence with a ranch gate and a solar powered electric gate. They worked efficiently and with great care of the property.
Back Country Excavation LLC
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Reviewed in February 2026
Had very good knowledge base of our needs and completed the install very sufficiently.
TechBoy Media LLC
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Reviewed in June 2025
Jose and his assistant did an awesome job installing tile to our bathroom and wine bar area. They were very professional, courteous, and easy to work with. They masked off the areas where the tile was beign installed so there was no mess to cleanup. They delivered as promised and were very...
Deluxe Tile LLC
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Reviewed in May 2025
Is good professional and install drywall
Framing and Drywall Service LLC
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Reviewed in April 2025
Louis was very professional and did a great job installing my new roof. He is very honest and hard working
L.L. Construction
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Reviewed in May 2024
George removed an old jetted bathtub and a shower stall. He built a walk in shower where the tub was and a closet where the shower was. He removed old floor tile and replaced the floor tile. Built a custom shower pan and installed stone on the pan for the new shower. Built a pony wall, tiled the...
Project Redeem
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Reviewed in November 2023
Rob did a complete new shower installation. New shower pan, tile on the walls and glass door installation. The project turned out great. He was on time when he said he would be there, and was very apologetic when the project was delayed in the middle due to him having Covid-19. Can't help...
Robs Renovation Solutions LLC
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Reviewed in August 2023
Anthony was awesome to work with. He listened to what I wanted and answered any questions I had. He was excellent at communicating with me over timeline, installing, and finishing work. I will totally be hiring them again for any concrete work I will do in the future.
Pine Mesa Concrete L.L.C.
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Doorbell Installation questions, answered by experts

Improves water efficiency, reduces oversight, and enhances landscape health.

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation:

If the insulation is over 15 years old
If the insulation is wet or moldy
If it is vermiculite insulation
If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

In some areas, insulation companies require a special license, while some states only require them to hold general contractor licenses. Some municipalities may not mandate any license, although you should always ensure a contractor is fully insured. You can use Angi’s license lookup tool to confirm whether or not an insulation contractor you’re considering holds the necessary license for your area. You can also contact the company for information regarding licenses, certifications, and insurance.

Insulating windows without plastic is usually the better method. Outside of simply replacing your windows, you could buy cellular shades, which trap air between the window and the home, add a window film that blocks UV rays and traps heat, or cover your windows with a low-emissivity coating called “low-E.”

Cellular shades, also known as honeycomb shades, are the most energy-efficient and insulating window treatments. Their honeycomb structure is made of soft fabric that forms layered cell pockets. These pockets trap air, creating a thermal barrier that reduces heat loss in the winter and blocks heat gain in the summer. For even greater insulation, consider double- or triple-cell varieties. Side-tracked cellular shades, which seal the edges of the window frame, can further minimize air leaks and maximize energy efficiency.

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